We won't come into contact with aliens in our life time (at least of extra terrestrial forms).
Life is a struggle for access to a limited amount of resources.
I don't see as a good thing to be the path of a stampede.
So what's the point of calling them here when we aren't yet able to create harmony and prosperity among us.
And no, people are selfish and some would betray our specie
in the hopes of achieving a better future for themselves and their beloved (and although it is a reasonable position in the short term, it has no viability in the long term, when the status quo would be altered and they were no longer needed).
It would be nice if mankind consider Earth and the Solar system to be a true sanctuary that it is to us (imho) before it starts to expand into other stars.
(And yes I believe that it is possible that in the future our descendents will met with extra terrestrial intelligent life form, but they will be human and descent also from us)
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